Stool for ingot-molds.



H. M. LANE.

STOOL FOR INGOT MOLDS.

APPLICATION FILED MAR. 22, 1917- Patehted Dec. 3, 1918.

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$3M, dz a M AZ HENRY M. LANE. OF CINCINNATI, OHIO.

STOOL FOR INGOT-MOLDS.

Specification of Letters Patent.

Patented Dec. 3, 1918.

Application filed March 22, 1917. Serial No. 156,625.

To all whom it may concern:

Be it known that I, HENRY M. LANE, a citizen of the United States, residing at Cincinnati, in the county of Hamilton'and State of Ohio have invented certain new and useful Improvements in Stools for Ingot-Molds; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to an improved form of stool for ingot molds used in casting steel and the like,and the object of the invention is to supply a form of stool whereby the formation of fins on the ingots may be certainly avoided, without resort to fire clay dams or other devices tending to affect injuriously the quality of the metal.

Steel ingots are generally cast in heavy iron molds which are set, generally in pairs, upon suitable stools or bases, whereby the lower end of each mold is closed, so as to confine the molten metal when poured.

When the bottom face of the mold and the top of the stool are left rough, a certain portion of the metal exudes and forms a projecting fin around the bottom of the ingot. This has two principal disadvantages. First, the fin end which goes into the reheating furnace is injurious to the refractory lining of the furnace; and secondly the bottom end of the ingot, carrying the fin, is placed in the rolls first, and when rolled down a lamination is produced which is very objectionable.

To remedy thisdifliculty. the chipping off of the fins has been resorted to, which involves waste of labor and time. It has also been proposed to machine the bottom faces of the molds to asmooth flat'surface, but this is not sufficient where the top face of the stool is not also a smooth flat surface.

The machining ofthis top surface of the stool has hitherto been impracticable or extremely awkward of accomplishment for the following reasons.

As the ingot molds are extremely heavy, sometimes weighing thousands of pounds, they are lowered to the tops of the stools by overhead cranes; and, as it is not eco-. nomical to provide laborers to guide each to its. place, it has been customarv to provide upstanding beveled or sloping-faced guiding flanges at the four corners, by the aid of which the man operating the crane can lower each mold to its place without extra assistance. These upstanding guides interfere with convenient machining of the upper or supporting face of the stool. I

It is the object of my present invention to provide a stool of such a form and coin struction that the entire supporting surface of a stool for one or more molds can be machined to a true smooth surface by asingle operation.

For this purpose I employ corner guides for the molds only at the outer corners and make their inner faces concentric with the center of the stool plate. I These. corner guldes are sufficient where only one mold is to be supported. Where two molds are supported, the inner sides of the molds are a guided by a central boss having sloping guiding sides also concentric with the center of the plate. By this means I have only to mount the whole plate in a boring mill so as to revolve it around the center in question, and am thus able to smooth the supporting surface and cut all the inclined guiding surfaces in one operation.

The invention may be embodied in a variety of forms, some of which are shown in the accompanying figures of drawing, wherein Figure 1 is a top view of one of my improved stools as used for a pair of molds, Fig. 2 is a side elevation of the same, Fig. 3 shows a modified form as used for three ingot molds, and Fig. t shows a modification as used for four molds.

In the form shown in Fig. 1, the base 10 is provided with a central guiding boss or projection 11, having conical faces 12 and 13 on its opposite sides, and at the two ends of said base upstanding guiding flanges 14, 15 and 16, 17 are provided at the four corners. These flanges, instead of being conformed to the shape of the ingot molds (indicated in dotted lines in Fig. 1) as has hitherto been the practice, are curved circularly with the center of the boss 11 as their center, and they are provided with inwardly facing conical guiding surfaces 18, 19 and 20, 21; also cut on radii from the same center. This construction makes it possible successfully to out a smooth upper face on the base 10 and smooth conical surfaces on the boss and flanges in one operation in a boring mill.

The general principle of the invention can be applied to a three-mold stool in the manner shown in Fig. 3; or to a four-mold stool in the manner shown in Fig. 4. It will be observed that all of these forms have a common characteristic, in that the guiding means provided for each ingot m'old comprises one or more concave projections on the outer side of the mold and a-convex pro jection 0n the inner side of the same. By the inner side is meant that nearerthe center, and by the outer side? is meant that 'away'froin' the c'enter'of the stool.

In Fig. 3, the outer molds (indicated in dotted lines) ar guided between the. concave projections 22,23,245, 25, and the convex projections 26 and 27. These latter are, of

course, concave: toward the central mold,

and serveas" guides 'for'it. All of the guiding-pr oj eeti'on's are-cut concentrically around the centerof the'sto'ol, thereby securing the benefits above described with referenc'eto the-mode ofcuttingand smoothing the-surfaces;- lt will-be seen that some of the guidesarecontinuous' across the 1111 width otthe stooL-Whileothers are separated by a sp'a'ce. These diflerences' show that'it is indifferent to m'y'invention whether or not the guides are carried across the'stool;

' Fig. 'tpresents a combination of the two forms shown in Figs. 1 and 8, and the-two inner molds of the total offour are guided in the same manner as are the two in Fig. 1,

while the outer molds in Figs. 3 and 4; are guided byidentical means.

What I claim is I 1.v A stool for ingot molds having a fiat face provided with outer and inner guiding projections, presenting to'the molds concentric guiding surfaces, respectively concave and convex, whereby the face of the stool and said guiding faces may be shaped in a boring mill or the like inone operation. 40 2. A stool for ingot molds having a fiat face'andouter and concentricinner guiding projectio'n's'ther'eon arranged so. as to admit andguidethe ingot molds between them, substantially as described, 3. A- stool for ingot inoldsliaving a flat face, an inner bos'shaving convex" sides and outerconcave guides having guiding surfaces concentric with said convex sides" of said boss. I j 5 4:. A stool for ingot moldsha'vi'n'g a fiat face, a central guiding boss with concave;v sides, and two sets of inwardly concave guides having guiding; surfaces concentric with the-convexsurfaces of said boss, the

intermediate guides also having convex guiding surfaces] concentric with the other guiding surfaces.

In testimonywh'ereof I afiix my signature.

HENRY M. LANE.

Gopi es'of' this patent may be obtained for'five cents each, 'by addressingthe-Commissioner orratents,

' Washington, D. 6. 

